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# Table 3
**Effect of the physical activity on BMC at follow up**

Variable | Coefficient estimate | Standard error | P- value |
---|---|---|---|

BMC _{baseline}
| 0.44 | 0.03 | <0.001 |

BA follow up | 0.97 | 0.04 | <0.001 |

Gender | 35.20 | 9.50 | <0.001 |

{\theta}_{\mathit{mh}}\phantom{\rule{0.5em}{0ex}}=\phantom{\rule{0.5em}{0ex}}\mathit{\text{log}}\left(\frac{{\pi}_{\mathit{mh}}}{{\pi}_{l}}\right) | 20.94 | 6.58 | 0.001 |

{\theta}_{s}\phantom{\rule{0.5em}{0ex}}=\phantom{\rule{0.5em}{0ex}}\mathit{\text{log}}\left(\frac{{\pi}_{s}}{{\pi}_{l}}\right) | 27.77 | 8.17 | 0.001 |

Gender # θ
_{
s
}
| −36.03 | 13.11 | 0.006 |

Height _{follow up}
| −3.96 | 0.17 | <0.001 |

Puberty _{follow up}
| 29.99 | 3.52 | <0.001 |

Gender # puberty | −16.95 | 5.14 | 0.001 |